User guide

Appendix A
Fiber Optic Modules
5
EtherFast® 16-Port and 24-Port 10/100 Ethernet Switches
Appendix A:
Fiber Optic Modules
(Models EF3116 & EF3124 ONLY)
IMPORTANT: Fiber Optic Modules will only
function with model numbers: EF3116 and
EF3124. If you are not sure of the Switch’s model
number, make sure there is a fiber optic module
port in the front of the Switch. If it does not
have a fiber optic module port, your Switch will
not function with Fiber Optic Modules.
Some Ethernet Switches are equipped with an expansion
port for adding optional fiber optic expansion modules.
The 100BaseFX Fiber Modules allow you to connect the
Ethernet Switch to other switches, hubs, or routers in
fiber optic network backbones. These modules use high-
bandwidth, multimode fiber optic cabling with SC type
connectors.
Fiber cabling can transmit your Switch’s data up to 2000
meters (6560 feet) away to another switch without
requiring signal regeneration. The 100BaseFX SC Fiber
Module (model number EF31SC) is available through your
Linksys dealer.
Installing a Fiber Optic Expansion Module
To install a fiber module into the Ethernet Switch’s
expansion port, follow these instructions:
Before installing the fiber optic module, you must first 1.
power off the Switch by removing the AC power cord.
If the Switch is rack mounted, you should remove the
Switch from the rack temporarily until the fiber optic
module is installed.
Remove the faceplate from the unit by loosening the 2.
screws on either side with a screwdriver. Remove
the expansion module from its packaging. Keep the
screws for securing the fiber module to the Switch in
step 4.
Slide your fiber expansion module into the Switch. The 3.
module should fit snugly into the Switch’s expansion
port.
Secure the fiber module with the screws from the 4.
faceplate. You may now remount the Switch into its
rack if needed, then reconnect the AC power cable to
power on the Switch and resume normal operation.
Install your multimode fiber optic cabling from the 5.
module.
Use the guidelines below to plan the layout of your
network with other fiber-equipped devices from your
Switch’s 100BaseFX fiber module.
100BaseFX Fiber Cabling Distance Limitations
From To Duplex Max. Distance
The
Ethernet
Switch
Switch or
Distance
Extender
Full
2000 meters
(6560 feet)
Half
412 meters
(1350 feet)
Fiber
Transceiver
Half only*
208 meters
(682 feet)
* A distance extender has an internal switch, whereas a
transceiver does not. Switches generally use distance
extenders, and hubs utilize both types of modules.